Dwayne "The Rock" Johnson, right, appears with Rob Corddry in the HBO series Ballers. Jeff Daly/HBO hide caption

itoggle caption Jeff Daly/HBO

This is a calculated flood map for the city of St. Louis. Water depth goes from deep (dark blue) to shallow (white, light blue). Floodwater can come from the Illinois, Upper Mississippi and Missouri rivers, as well as from heavy local precipitation. Courtesy of Dag Lohmann/Katrisk hide caption

itoggle caption Courtesy of Dag Lohmann/Katrisk

Siri's answer to the brain-teaser question "What's zero divided by zero" generates a response that people find both funny and unnerving. NPR hide caption

itoggle caption NPR

Apple's senior vice president of Internet Software and Services Eddy Cue speaks about Apple Music during the keynote at the annual developers conference. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Arturo Martinez watches his wife, Aurora Martinez, put on makeup in their San Rafael, Calif., home. She has Alzheimer's. Lynne Shallcross for NPR hide caption

itoggle caption Lynne Shallcross for NPR

Melissa Malzkuhn, director of the Motion Light Lab at Gallaudet University, suits up in motion capture to record a nursery rhyme for deaf children. Emma Bowman/NPR hide caption

itoggle caption Emma Bowman/NPR

Anna Akana, a bespectacled, 25-year-old comedian who writes, directs and stars in skits about everything from personal stories, to friendship and even dealing with anxiety, says she is sort of over YouTube. Anna Akana/Screenshot via YouTube hide caption

itoggle caption Anna Akana/Screenshot via YouTube